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    CVE-2026-82189

    Joomla Extension - j2commerce.com - Any order can be marked Failed by anyone in J2Store 1.0.0-3.3.2, 4.0.0-4.0.22, 4.1.0-4.1.7 - Unauthenticated denial-of-service against the order pipeline: mass-failing pending orders to disrupt revenue and force manual reprocessing, or flipping already-fulfilled orders back to `FAILED` to cause operational confusion (unwarranted refunds/cancellations, customer-support load). Unlike the earlier confirmation-fraud issue, this required no correct payment amount or transaction data at all.

    Published:Sep 15, 2026
    Last Modified:Sep 15, 2026
    EPS:Sep 15, 2026
    EPSS Score:
    CVSS Score:8.7

    Affected Products

    Vendor
    J2commerce.com
    Product
    J2store Extension For Joomla

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-146 XML Schema Poisoning
    CAPEC-162 Manipulating Hidden Fields
    CAPEC-202 Create Malicious Client
    CAPEC-207 Removing Important Client Functionality
    CAPEC-208 Removing/short-circuiting 'Purse' logic: removing/mutating 'cash' decrements
    CAPEC-21 Exploitation of Trusted Identifiers
    CAPEC-226 Session Credential Falsification through Manipulation
    CAPEC-31 Accessing/Intercepting/Modifying HTTP Cookies
    CAPEC-383 Harvesting Information via API Event Monitoring
    CAPEC-384 Application API Message Manipulation via Man-in-the-Middle
    CAPEC-385 Transaction or Event Tampering via Application API Manipulation
    CAPEC-386 Application API Navigation Remapping
    CAPEC-387 Navigation Remapping To Propagate Malicious Content
    CAPEC-388 Application API Button Hijacking
    CAPEC-39 Manipulating Opaque Client-based Data Tokens

    Related CVEs

    CVE-2026-82190 (CVSS 6.3) — Joomla Extension - j2commerce.com - Predictable/forgeable order access token in J2Store 1.0.0-3.3.2, 4.0.0-4.0…
    CVE-2026-78081 (CVSS 7.1) — Joomla Extension - j2commerce.com - Missing CSRF protection on cart, checkout and myprofile controllers in J2S…
    CVE-2026-81568 (CVSS 8.7) — Joomla Extension - j2commerce.com - Arbitrary file read via `task=download` in J2Store 1.0.0-3.3.2, 4.0.0-4.0.…
    CVE-2026-82191 (CVSS 5.3) — Joomla Extension - j2commerce.com - Unescaped request data reflected into PayPal notify redirect in J2Store 1.…
    CVE-2026-81567 (CVSS 8.7) — Joomla Extension - j2commerce.com - Unauthenticated blind SQL injection in the storefront product list in J2St…
    CVE-2026-78000 (CVSS 5.3) — Joomla Extension - j2commerce.com - Reflected XSS via `filter_tag`, `pricefrom` and `priceto` in J2Store 1.0.0…
    CVE-2026-78069 (CVSS 9.5) — Joomla Extension - j2commerce.com - Missing authorization on Apps controller delegation chain in J2Store 1.0.0…
    CVE-2026-78065 (CVSS 7.1) — Joomla Extension - j2commerce.com - Guest checkout address disclosure to any authenticated user (IDOR) in J2St…
    CVE-2026-77999 (CVSS 8.7) — Joomla Extension - j2commerce.com - Unauthenticated PayPal callback forgery leading to order confirmation frau…
    CVE-2026-78064 (CVSS 8.8) — Joomla Extension - j2commerce.com - Anonymous cart-record tampering via inherited FOF `save` task in J2Store 1…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High